WO2012023552A1 - Mobile terminal apparatus and wireless communication method - Google Patents
Mobile terminal apparatus and wireless communication method Download PDFInfo
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- WO2012023552A1 WO2012023552A1 PCT/JP2011/068548 JP2011068548W WO2012023552A1 WO 2012023552 A1 WO2012023552 A1 WO 2012023552A1 JP 2011068548 W JP2011068548 W JP 2011068548W WO 2012023552 A1 WO2012023552 A1 WO 2012023552A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
Definitions
- the present invention relates to a mobile terminal apparatus and a radio communication method in a next-generation mobile communication system.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- LTE Long Term Evolution
- SC-FDMA Single Carrier
- a signal transmitted on the uplink is mapped to an appropriate radio resource and transmitted from the mobile terminal apparatus to the radio base station apparatus.
- user data (UE (User Equipment) # 1, UE # 2) is assigned to an uplink shared channel (PUSCH: Physical Uplink Shared CHannel).
- Control information is time-multiplexed with PUSCH when transmitting simultaneously with user data, and assigned to an uplink control channel (PUCCH: Physical Uplink Control CHannel) when transmitting only control information.
- the control information transmitted in the uplink includes downlink quality information (CQI: Channel Quality Indicator) and a retransmission response signal (ACK / NACK) for a downlink shared channel (PDSCH: Physical Downlink Shared CHannel) signal. Etc. are included.
- the PUCCH subframe configuration includes seven SC-FDMA symbols in one slot (1/2 subframe). Also, one SC-FDMA symbol includes 12 information symbols (subcarriers). Specifically, in the CQI subframe configuration (CQI format), as shown in FIG. 2A, the second symbol (# 2) and the sixth symbol (# 6) in the slot have a reference signal (RS). The control information (CQI) is multiplexed on other symbols (first symbol (# 1), third symbol (# 3) to fifth symbol (# 5), seventh symbol (# 7)).
- the reference signal is multiplexed on the third symbol (# 3) to the fifth symbol (# 5) in the slot, and so on.
- Control information (ACK / NACK) is multiplexed on the first symbol (first symbol (# 1), second symbol (# 2), sixth symbol (# 6), and seventh symbol (# 7)).
- the slot is repeated twice.
- the PUCCH is multiplexed on radio resources at both ends of the system band, and frequency hopping (Inter-slot FH) is applied between two slots having different frequency bands in one subframe.
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE advanced or “LTE enhancement”.
- LTE-A In the LTE-A system, with the goal of further improving frequency utilization efficiency, peak throughput, etc., allocation of frequencies wider than LTE is being studied.
- LTE-A for example, Rel. 10
- backward compatibility with LTE is one requirement, and a basic frequency block having a bandwidth that can be used by LTE (A transmission band configuration having a plurality of component carriers (CC) is adopted.
- CC component carriers
- the feedback control information for the data channel transmitted by a plurality of downlink CCs simply increases to the number of CCs.
- technologies specific to LTE-A such as multi-cell coordinated transmission / reception technology and MIMO (Multiple Input Multiple Output) technology using more transmission / reception antennas than LTE are being studied, and feedback to control them.
- An increase in control information is also conceivable. For this reason, since the amount of feedback control information increases, it is necessary to study a method for transmitting feedback control information in an uplink channel.
- the present invention has been made in view of the above points, and in a communication system having a system band composed of a plurality of basic frequency blocks, a mobile terminal capable of efficiently transmitting feedback control information through an uplink control channel
- An object is to provide an apparatus and a wireless communication method.
- the mobile terminal apparatus of the present invention is a mobile terminal apparatus that performs radio communication in a system band composed of a plurality of fundamental frequency blocks, and a demodulator that demodulates a downlink shared channel signal for each of the plurality of fundamental frequency blocks;
- a determination unit that determines a state of a retransmission response signal for each of a plurality of basic frequency blocks based on the demodulated downlink shared channel signal, and an uplink of a specific basic frequency block selected from the plurality of basic frequency blocks
- An uplink control channel processing unit that maps retransmission response signals of a plurality of basic frequency blocks to the control channel, the uplink control channel processing unit selects a plurality of allocated resources from the uplink control channel, and
- the state of the retransmission response signal of the fundamental frequency block of bit information and channel by phase shift keying It characterized in that it defined in-option information.
- the feedback control information can be efficiently transmitted through the uplink control channel.
- a retransmission response signal (ACK / NACK) that is feedback control information is transmitted on the uplink control channel (PUCCH).
- the retransmission response signal is expressed by an acknowledgment (ACK: ACKnowledgement) indicating that the transmission signal has been properly received or a negative response (NACK: Negative ACKnowledgement) indicating that it has not been properly received.
- each component carrier is based on signals for each of a plurality of component carriers (here, CC # 1, CC # 2) received from the radio base station apparatus.
- CC # 1 component carriers
- CC # 2 component carriers
- both the reception channel quality information (CQI) and the retransmission response signal (ACK / NACK) transmitted on the PUCCH are transmitted in the 12 subcarrier band.
- CQI reception channel quality information
- ACK / NACK retransmission response signal
- 3SC-FDMA symbols are used for RS among 7SC-FDMA symbols in one slot.
- Orthogonal CDMA by twelve cyclic shifts is defined in one SC-FDMA symbol.
- a maximum of 12 ⁇ 3 36 channels can be multiplexed ( Resource).
- LTE (Rel. 8) defines ACK / NACK (Format 1a / 1b) notification for downlink shared channel (PDSCH) signals (see FIG. 4), and can notify the following multiple states: It has become.
- the code word indicates a coding unit of channel coding (error correction coding), and one or a plurality of code words are transmitted when MIMO multiplex transmission is applied.
- a maximum of 2 codewords are used in single user MIMO.
- each layer is an independent codeword, and in the case of four-layer transmission, one codeword is provided for every two layers.
- ACK means successful transmission
- NACK means that an error has been detected
- DTX means that no data has been recognized (no response).
- the DTX is a determination result that “ACK and NACK were not notified from the mobile terminal device”, which means that the mobile terminal device could not receive the downlink control channel (PDCCH: Physical Downlink Control CHannel). .
- PDCCH Physical Downlink Control CHannel
- the radio base station apparatus when receiving the ACK, the radio base station apparatus transmits the next new data, but in the case of NACK or a DTX state where there is no response, the radio base station apparatus performs retransmission control so as to retransmit the transmitted data. Note that the radio base station apparatus can determine that it is DTX when the received power in the resource allocated to ACK / NACK in the uplink is equal to or less than a predetermined value.
- “0” indicates that the mobile terminal apparatus does not transmit information to the radio base station apparatus in the subframe
- “1”, “ ⁇ 1”, “j”, “ ⁇ j” represents a predetermined phase state (bit information).
- “1” and “ ⁇ 1” correspond to “0” and “1”, respectively, and can represent 1-bit information.
- “1”, “ ⁇ 1”, “j”, and “ ⁇ j” correspond to data of “00”, “11”, “10”, and “01”, respectively.
- Information can be represented. Therefore, in ACK / NACK (Format 1a / 1b), transmission of up to 2 bits is possible.
- the user terminal UE changes the above-mentioned 3 states (1 codeword) or 5 states (2 codewords) to a specific CC (for example, CC # 1).
- CC # 1 a specific CC
- the present inventor when aggregating and transmitting retransmission response signals for the downlink shared channel signals of a plurality of CCs to the uplink control channel of a specific CC, a plurality of allocated resources in the uplink control channel. (Channel) is selected, and the states of the retransmission response signals of a plurality of CCs are defined by bit information by phase shift keying and resource selection information which is a selection position of allocated resources, and the present invention is completed. It was.
- the present invention is not limited to the case where it is applied to LTE-A.
- the present invention may be applied to any communication system as long as it is a communication system that transmits uplink control information in the uplink in carrier aggregation in which a plurality of fundamental frequency blocks are integrated to widen the band.
- the number of downlink CCs is two (or 1). It can be applied even if there are more cases.
- the retransmission response signal (ACK / NACK / DTX) will be described as feedback control information mapped to the uplink control channel, the present invention is not limited to this.
- Figure 5 specifies the status of the PCC and SCC retransmission response signals in the system band composed of the first basic frequency block (PCC: Primary Component Carrier) and the second basic frequency block (SCC: Second Component Carrier). Shows the mapping table.
- the mobile terminal apparatus maps the retransmission response signal to the uplink control channel based on the mapping table and transmits it to the radio communication apparatus.
- FIG. 5A shows an example of a mapping table when the number of allocated resources for transmission of a retransmission response signal is two when no spatial multiplexing is applied to PCC and SCC (rank 1).
- Three states (ACK, NACK, DTX) are defined per CC, and nine combinations of PCC and SCC states are conceivable.
- the three states “ACK”, “NACK”, and “DTX” of the PCC retransmission response signal are defined by bit information by phase shift keying (here, QPSK data modulation), and the SCC retransmission response signal
- the three states “ACK”, “NACK”, and “DTX” are resource selection information (“Channel selection”) indicating which of the two allocated resources (Ch1, Ch2) has been selected. Information ”).
- resource selection information (“Channel selection”) indicating which of the two allocated resources (Ch1, Ch2) has been selected.
- Information When the number of allocated resources is 2, 1-bit information can be added as resource selection information. Therefore, when combined with bit information by QPSK data modulation, 3-bit information can be supported.
- the state of the SCC retransmission response signal is specified by 1-bit resource selection information.
- two states of “DTX” or “NACK” and “ACK” are determined by the resource selection information, and the number of states that can be notified individually is reduced.
- Ch1 is selected from the allocated resources (when bit information is mapped to Ch1 and transmitted)
- the SCC state is either “DTX” or “NACK”.
- Ch2 is selected (when bit information is mapped to Ch2 and transmitted)
- the resource selection information is defined so that the “ACK” state can be distinguished, and the “DTX” and “NACK” states are combined. The number of bits is saved by setting.
- the radio base station apparatus When the retransmission response signal is “DTX” or “NACK”, since the radio base station apparatus performs retransmission control so as to retransmit the transmitted data, even if it is not possible to distinguish between DTX and NACK The impact is small.
- the retransmission response signal is “ACK”, since the radio base station apparatus transmits the next new data, it is preferable to prescribe so that the AKC state can be distinguished preferentially. Therefore, as shown in FIG. 5A, when the number of allocated resources is two (adding 1-bit information by resource selection), it is determined that the “ACK” state can be preferentially distinguished in the SCC. preferable.
- 3-bit information can be supported by specifying the two allocation resources with the bit information by phase shift keying and the resource selection information.
- bit information is allocated to both of the two allocation resources, by assigning bit information to only one resource, it is possible to maintain the single carrier characteristic.
- the CC (here, it gives priority) concerned PCC) is preferably defined by bit information by QPSK data modulation, and is defined by resource selection information for other CCs (here, SCC).
- SCC resource selection information for other CCs
- the state of the PCC retransmission response signal can be defined in detail and notified. For example, in the mapping table shown in FIG. 5A, it is possible to support the PCC so that it can be individually notified (Explicit DTX signaling) that it is in the “DTX” state.
- FIG. 5B shows an example of a mapping table in the case where spatial multiplexing is applied to PCC and SCC (rank 2) and the number of allocated resources for transmission of a retransmission response signal is two.
- the PCC state is defined by bit information by phase shift keying (here, QPSK data modulation), and the SCC state is defined by resource selection information.
- the information bits are not assigned to “DTX” alone, and the four states “ACK, ACK”, “ACK, NACK”, “NACK, Preferably, bit information is individually assigned to “ACK”, “NACK, NACK / DTX” and notified.
- layer 1 and layer 2 are “ ⁇ 1” for “ACK, ACK”, “j” for “ACK, NACK”, “ ⁇ j”, “NACK,” for “NACK, ACK”.
- Bit information of “1” is defined in “NACK” or “DTX”. That is, in the case of two codewords, one information bit “1” is assigned to the “NACK, NACK” or “DTX” state of the PCC, and the number of states that can be notified individually is reduced. .
- the state of “DTX”, “NACK, NACK”, “NACK, ACK” or “ACK, NACK” with 1-bit resource selection information , “ACK, ACK” are preferably defined.
- the SCC status is any one of “DTX”, “NACK, NACK”, “NACK, ACK” or “ACK, NACK”.
- Ch2 it indicates that the state is “ACK, ACK”.
- the SCC state apply spatial bundling and determine each state so that ACK is returned only when both layers are ACK when transmitting two codewords, and NACK is returned otherwise. Can do.
- the state of the PCC retransmission response signal to be used preferentially is defined by bit information by QPSK data modulation, the state of the SCC retransmission response signal is defined by resource selection information, By defining the bit information and the resource selection information so that “ACK, ACK” can be distinguished, the number of bits can be saved and the feedback control information can be transmitted efficiently.
- FIG. 6 shows an example of the mapping table when the number of allocated resources is four.
- FIG. 6A shows an example of a mapping table when there is no application of spatial multiplexing to PCC and SCC (rank 1)
- FIG. 6B shows an example of a mapping table when there is application of spatial multiplexing to PCC and SCC (rank 2).
- states of the PCC retransmission response signal “ACK”, “NACK”, and “DTX” are defined by bit information by phase shift keying (here, QPSK data modulation), and the SCC retransmission response signal This is defined by resource selection information indicating which resource is selected from the four resources (Ch1 to Ch4) to which the states “ACK”, “NACK”, and “DTX” are assigned.
- resource selection information indicating which resource is selected from the four resources (Ch1 to Ch4) to which the states “ACK”, “NACK”, and “DTX” are assigned.
- 2-bit information can be added by the resource selection information. Therefore, 4-bit information can be supported when combined with bit information by QPSK data modulation.
- bit information by QPSK data modulation is individually assigned and notified to the three PCC states “DTX”, “NACK”, and “ACK”. For example, “j (10)” can be assigned to “DTX”, “1 (00)” can be assigned to “NACK”, and “ ⁇ 1 (11)” can be assigned to “ACK”. In this case, since an information bit can be independently assigned to “DTX”, it is possible to notify the radio base station apparatus that it is in the “DTX” state (Explicit DTX signaling).
- the state of “DTX”, “NACK”, and “ACK” can be determined by the 2-bit resource selection information for the SCC state, the “DTX”, “NACK”, and “ACK”
- resource selection information can be individually assigned and notified.
- the SCC state is “DTX”
- Ch2 when Ch1 is selected, the SCC state is “NACK”.
- Ch3 when Ch3 is selected, it can be determined that the state is “ACK”.
- an information bit can be independently assigned to “DTX” of SCC.
- Ch4 is not necessarily required.
- PCC layer 1 and layer 2 are “ ⁇ 1” for “ACK and ACK”, “j” for “ACK and NACK”, “ ⁇ j” and “ ⁇ ” for “NACK and ACK”.
- Bit information of “1” is defined in “NACK, NACK” or “DTX”. That is, in the case of 2 codewords, by assigning one information bit “1” to the state of “NACK, NACK” or “DTX”, the number of states that can be notified individually is reduced. Savings are being made.
- the state of each layer of the SCC can be supported by 2-bit resource selection information. Therefore, as in the case of the PCC, regarding the state of each layer of the SCC, the information bits are not assigned to “DTX” alone, and the four states “ACK, ACK” / “ACK, NACK” / “NACK, ACK” / For “NACK, NACK / DTX”, resource selection information may be individually assigned and notified.
- Ch1 when Ch1 is selected from the two allocated resources, this indicates that the state of the SCC is “DTX” or “NACK, NACK”, and Ch2 is selected.
- the PCC is defined to be equivalent to the LTE (Rel. 8) ACK / NACK (Format 1a / 1b) mapping table.
- the PCC state and SCC state are respectively determined by QPSK data modulation so that it is possible to individually notify the radio base station apparatus that it is in the “DTX” state (Explicit DTX signaling). It is defined by combining bit information and resource selection information.
- FIG. 7 shows an example of a mapping table when the number of allocated resources is two.
- FIG. 7A shows the case where no spatial multiplexing is applied to PCC (rank 1)
- FIG. 7B shows the case where spatial multiplexing is applied to PCC.
- the case (rank 2) is shown.
- 7A and 7B show the cases of rank 1 and rank 2 for the SCC state.
- the PCC is one codeword transmission (see FIG. 7A)
- the relation between the three states “DTX”, “NACK” and “ACK” of the PCC retransmission response signal and the state of the SCC retransmission response signal is considered.
- the bit information and the resource selection information are respectively defined by QPSK data modulation. Here, it sets so that the information notified when SCC is DTX can be distinguished independently.
- the three PCC states “DTX”, “NACK”, and “ACK” are defined using bit information and resource selection information by QPSK data modulation in consideration of the relationship with the SCC state, and the SCC
- the mapping table As shown in FIG. 7A, when the SCC is DTX, it is equivalent to the LTE (Rel. 8) ACK / NACK (Format 1a) mapping table (see FIG. 4A above). be able to.
- mapping table for PCC can be made common regardless of the presence or absence of carrier aggregation, and instantaneous interruption of communication during the process of switching the presence or absence of carrier aggregation can be prevented.
- the wireless base station device is set in the “DTX” state. It is possible to notify that there is something (Explicit DTX signaling).
- the four PCC states “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, and “ACK, ACK” are related to the SCC state. Are defined using bit information and resource selection information by QPSK data modulation.
- FIG. 8 shows an example of the mapping table when the number of allocated resources is four.
- FIG. 8A shows an example of a mapping table when there is no application of spatial multiplexing to PCC (rank 1)
- FIG. 8B shows an example of a mapping table when application of spatial multiplexing is applied to PCC (rank 2).
- 8A and 8B show the cases of rank 1 and rank 2 for SCC.
- mapping table shown in FIG. 8 it is possible to configure in detail the status of the PCC and SCC retransmission response signals and notify them.
- SCC When the SCC is DTX, it can be equivalent to the LTE (Rel.8) ACK / NACK (Format 1a / 1b) mapping table (see FIG. 4 above).
- the number of allocated resources is 2 or 4 is described in the mapping table described above, the number of allocated resources is not limited to this. Further, the number of allocated resources can be determined from various viewpoints. For example, as an example of a method for determining the number of allocated resources, it can be determined according to the number of codewords.
- FIG. 12 shows a case where both PCC and SCC are one codeword (number of allocated resources is two), and FIG. 13 shows a case where one of PCC and SCC is one codeword and the other is two codewords (allocation).
- FIG. 14 shows a case where both PCC and SCC are two codewords (number of allocated resources is 4).
- the PCC when the SCC is DTX, the PCC is defined to be equivalent to the LTE (Rel.8) ACK / NACK (Format 1a / 1b) mapping table. Also, when at least PCC is 1 codeword, PCC status and SCC status so that it is possible to individually notify the radio base station device that PCC is in “DTX” status (Explicit DTX signaling) Are defined in combination with bit information and resource selection information by QPSK data modulation.
- PCC and SCC are 1 codeword transmission (see FIG. 12)
- two resources are allocated, and the state of the PCC retransmission response signal and the state of the SCC retransmission response signal are selected by bit information and resource selection by QPSK data modulation. Specify using information. Also, the information notified when the PCC is DTX is set so that it can be distinguished independently.
- an information bit of “1” is assigned to the “NACK” of the SCC and “ ⁇ 1” is assigned to the “ACK”, and Ch2 is selected (the information bit is selected). Mapping to Ch2). Further, when the SCC is in the state of “DTX” or “NACK”, information bits “1” are assigned to “NACK” and “ ⁇ 1” are assigned to “ACK”, and Ch1 is selected. As described above, the number of states that can be notified individually can be reduced by defining the SCC “DTX” or “NACK” without individually allocating information bits.
- mapping table when the SCC is DTX, it can be equivalent to the LTE (Rel.8) ACK / NACK (Format 1a) mapping table (see FIG. 4A above). it can.
- the notification information in the case where the PCC is in the DTX state is distinguished from other notification information and is singly defined so that the radio base station apparatus is in the “DTX” state. It becomes possible to send notification (Explicit DTX signaling) alone.
- the four PCC states “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ACK, ACK
- the SCC is “DTX”, “1”, “ ⁇ j”, “j”, and “ ⁇ 1” are assigned and Ch1 is selected.
- SCC is DTX, it can be made equivalent to the LTE (Rel.8) ACK / NACK (Format 2a) mapping table (see FIG. 4B above).
- Ch3 is selected for “NACK” of SCC, and “ACK” of SCC is selected. Selects Ch2.
- SCC is other than “DTX”
- Ch3 is selected for “ACK, ACK” of PCC
- “ ⁇ 1” is assigned to “NACK” of SCC
- ACK is assigned to “ACK”. Assign “1”.
- Ch2 is selected when the PCC is in the “DTX” state, and “ ⁇ j” for each of the three SCC states “NACK, ACK”, “ACK, NACK”, and “ACK, ACK”. , “J”, “ ⁇ 1” are assigned. Further, when the PCC is in the “DTX” state and the SCC is “NACK, NACK”, “DTX”, all allocated resources are set to “0”, and transmission is not performed in the subframe. ing.
- both the PCC and the SCC are two codewords (see FIG. 14)
- four resources are allocated, and the state of the PCC retransmission response signal and the state of the SCC retransmission response signal are expressed as bit information by QPSK data modulation. Defined using resource selection information.
- mapping tables shown in FIGS. 12 to 14 are examples, and the mapping tables applicable in the present invention are not limited to this.
- the relationship between the number of codewords and the number of allocated resources is not limited to this. For example, when both the PCC and the SCC are one codeword, four resources may be allocated (see FIG. 6). When one of the SCCs is one codeword and the other is two codewords, two or four resources may be allocated (see FIGS. 7 and 8).
- FIG. 9 is a diagram for explaining a configuration of the mobile communication system 10 including the mobile terminal apparatus 100 and the radio base station apparatus 200 according to an embodiment of the present invention.
- the mobile communication system 10 illustrated in FIG. 9 is a system including an LTE system, for example.
- the mobile communication system 10 may be referred to as IMT-Advanced or 4G.
- the mobile communication system 10 includes a radio base station apparatus 200 and a plurality of mobile terminal apparatuses 100 (100 1 , 100 2 , 100 3 ,... 100 n that communicate with the radio base station apparatus 200.
- N is an integer of n> 0).
- Radio base station apparatus 200 is connected to core network 40.
- the mobile terminal apparatus 100 communicates with the radio base station apparatus 200 in the cell 50.
- the core network 40 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- OFDMA is applied to the downlink and SC-FDMA is applied to the uplink as the radio access scheme.
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single carrier transmission method in which data is mapped to a continuous band for each terminal for communication, and a plurality of terminals use different bands to realize multi-access.
- PDSCH that transmits traffic data of each mobile terminal apparatus 100
- L1 / L2 control information such as RB allocation information in PDSCH, data modulation scheme / channel coding rate, and retransmission related information to each mobile terminal apparatus PDCCH or the like for notifying is used.
- reference signals used for channel estimation, reception quality measurement and the like are transmitted together with these channels.
- PUSCH for transmitting traffic data of each mobile terminal apparatus 100 For the uplink, PUSCH for transmitting traffic data of each mobile terminal apparatus 100, channel quality information (CQI) report for downlink frequency scheduling, and L1 / L2 control information such as ACK / NACK for downlink transmission data are transmitted. PUCCH or the like is used. Also, a demodulation reference signal used for channel estimation and a channel quality measurement reference signal used for channel quality measurement are transmitted together with these channels.
- CQI channel quality information
- uplink control information when uplink control information is transmitted from the mobile terminal apparatus in the uplink, a plurality of users are orthogonally multiplexed using a cyclic shift of the CAZAC code sequence, and a retransmission response signal as feedback control information is transmitted.
- a case of transmission will be described.
- a case where a retransmission response signal for a downlink shared channel received from two CCs is specified and transmitted is shown, but the number of CCs and feedback control information are not limited thereto.
- the mobile terminal apparatus shown in FIG. 10 includes a transmission unit and a reception unit.
- the reception unit includes an OFDM signal demodulation unit 1401 that demodulates the OFDM signal, and an ACK / NACK / DTX determination unit 1402 that determines ACK / NACK / DTX based on the downlink signal.
- the transmission unit includes a control information transmission channel selection unit 1201, an uplink shared channel (PUSCH) processing unit 1000, an uplink control channel (PUCCH) processing unit 1100, an SRS processing unit 1300, a channel multiplexing unit 1202, and an IFFT. Part 1203 and CP providing part 1204.
- the OFDM signal demodulator 1401 receives and demodulates the downlink OFDM signal. That is, CP is removed from the downlink OFDM signal, fast Fourier transform is performed, subcarriers to which the BCH signal or downlink control signal is assigned are extracted, and data demodulation is performed. When downlink OFDM signals are received from a plurality of CCs, data demodulation is performed for each CC. OFDM signal demodulation section 1401 outputs the downlink signal after data demodulation to ACK / NACK / DTX determination section 1402.
- the ACK / NACK / DTX determination unit 1402 determines whether or not the received downlink shared channel signal (PDSCH signal) has been received without error. If the downlink shared channel signal has been received without error, an ACK or error is detected. If it is detected, each status of NACK is output as a determination result, and if no downlink shared channel signal is detected, each state of DTX is output as a determination result. When a plurality of CCs are allocated for communication with the radio base station apparatus, it is determined whether or not the downlink shared channel signal can be received without error for each CC. The ACK / NACK / DTX determination unit 1402 determines the above three states for each codeword. When transmitting two code words, the above three states are determined for each code word. ACK / NACK / DTX determination section 1402 outputs the determination result to the transmission section (here, control information transmission channel selection section 1201).
- PDSCH signal downlink shared channel signal
- the control information transmission channel selection unit 1201 selects a channel for transmitting a retransmission response signal that is feedback control information. Specifically, it is determined whether to transmit in the uplink shared channel (PUSCH) or to transmit in the uplink control channel (PUCCH). For example, if there is a PUSCH signal in the subframe at the time of transmission, the PUSCH signal is output to the uplink shared channel processing unit 1000, and the retransmission response signal is mapped to the PUSCH and transmitted. On the other hand, if there is a PUSCH signal in the subframe, the PUSCH signal is output to the uplink control channel processing unit 1100, and the retransmission response signal is mapped to the PUCCH and transmitted.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- Uplink shared channel processing section 1000 includes control information bit determining section 1006 that determines the bits of the retransmission response signal based on the determination result of ACK / NACK / DTX determining section 1402 and error correction coding of the ACK / NACK bit sequence.
- a channel encoding unit 1007 that performs error correction encoding on a data sequence to be transmitted, data modulation units 1002 and 1008 that perform data modulation on the encoded data signal, and the modulated data signal and retransmission
- a time multiplexing unit 1003 that time-multiplexes the response signal
- a DFT unit 1004 that performs DFT (Discrete Fourier Transform) on the time-multiplexed signal
- a subcarrier mapping unit 1005 that maps the signal after DFT to a subcarrier.
- the uplink control channel processing unit 1100 is modulated by the channel selection control unit 1101 that controls allocation resources and allocation information used for retransmission response signal transmission, the PSK data modulation unit 1102 that performs PSK data modulation, and the PSK data modulation unit 1102.
- a cyclic shift section 1103 for applying a cyclic shift to the received data a block spreading section 1104 for performing block spreading on the signal after the cyclic shift using a block spreading code, and a subcarrier mapping section 1105 for mapping the signal after the block spreading to a subcarrier. And have.
- the channel selection control unit 1101 controls selection of resources to map the retransmission response signal based on the mapping table. Specifically, based on the mapping tables shown in FIGS. 5 to 8 and FIGS. 12 to 14 and the determination result of the ACK / NACK / DTX determination unit 1402, a resource for mapping bit information is selected, Notify PSK data modulation section 1102, cyclic shift section 1103, block spreading section 1104, and subcarrier mapping section 1105.
- the mobile terminal apparatus has the mapping table of FIG. 5A
- the channel selection control unit 1101 notifies that bit information “1” is mapped to Ch2.
- the mobile terminal device may have a plurality of mapping tables, and the plurality of mapping tables may be selectively used according to a predetermined condition.
- the method for determining the number of allocated resources is not particularly limited, and may be determined by a method set in advance, a method selected by the mobile terminal apparatus based on the determination result of the ACK / NACK / DTX determination unit 1402, or a notification from the radio communication apparatus A determination method or the like can be used.
- a method for determining the number of allocated resources it can be determined according to the number of codewords as described above. For example, when both PCC and SCC are one codeword, two resources are allocated, when one of PCC and SCC is one codeword and the other is two codewords, three resources are allocated, and PCC and If both SCCs are 2 codewords, 4 resources can be allocated.
- the PSK data modulation unit 1102 performs phase shift keying (PSK data modulation) based on information notified from the channel selection control unit 1101 based on the mapping table. For example, the PSK data modulation section 1102 modulates to 2-bit bit information by QPSK data modulation.
- PSK data modulation phase shift keying
- the cyclic shift unit 1103 performs orthogonal multiplexing using a cyclic shift of a CAZAC (Constant Amplitude Zero Auto Correlation) code sequence. Specifically, the time domain signal is shifted by a predetermined cyclic shift amount. Note that the cyclic shift amount differs for each user and is associated with a cyclic shift number. Cyclic shift section 1103 outputs the signal after cyclic shift to block spreading section 1104. Block spreading section (orthogonal code multiplying means) 1104 multiplies the reference signal after the cyclic shift by the orthogonal code (block spread).
- CAZAC Constant Amplitude Zero Auto Correlation
- Block spreading section 1104 outputs the signal after block spreading to subcarrier mapping section 1105.
- the subcarrier mapping unit 1105 maps the signal after block spreading to the subcarrier based on the information notified from the channel selection control unit 1101. Further, subcarrier mapping section 1105 outputs the mapped signal to channel multiplexing section 1202.
- the SRS processor 1300 includes an SRS signal generator 1301 that generates an SRS signal (Sounding RS), and a subcarrier mapping 1302 that maps the generated SRS signal to a subcarrier. Subcarrier mapping 1302 outputs the mapped signal to channel multiplexing section 1202.
- SRS signal generator 1301 that generates an SRS signal (Sounding RS)
- subcarrier mapping 1302 that maps the generated SRS signal to a subcarrier.
- Subcarrier mapping 1302 outputs the mapped signal to channel multiplexing section 1202.
- the channel multiplexing unit 1202 time-multiplexes the signal from the uplink shared channel processing unit 1000 or the uplink control channel processing unit 1100 and the reference signal from the SRS signal processing unit 1300, and a transmission signal including the uplink control channel signal To do.
- the IFFT unit 1203 performs IFFT on the channel-multiplexed signal and converts it into a time domain signal.
- IFFT section 1203 outputs the signal after IFFT to CP giving section 1204.
- CP assigning section 1204 assigns a CP to the signal after orthogonal code multiplication. Then, an uplink transmission signal is transmitted to the radio communication apparatus using an uplink channel of a specific CC.
- the mobile terminal apparatus shown in FIG. 11 includes a transmission unit and a reception unit.
- the transmission unit includes an OFDM signal generation unit 2401 that generates an OFDM signal for each of a plurality of CCs.
- the OFDM signal generation unit 2401 maps downlink signals including other downlink channel signals and uplink resource allocation information signals to subcarriers, performs inverse fast Fourier transform (IFFT), and adds a CP, thereby adding a downlink transmission signal.
- IFFT inverse fast Fourier transform
- the receiving unit includes a CP removing unit 2204 that removes the CP from the received signal, an FFT unit 2203 that performs fast Fourier transform (FFT) on the received signal, and a channel that separates the multiplexed signals (PUSCH signal, PUCCH signal, SRS signal). It has a separation unit 2202, an uplink shared channel (PUSCH) reception unit 2000, an uplink control channel (PUCCH) reception unit 2100, and an SRS signal reception unit 2300 that process signals after channel separation.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- SRS signal reception unit 2300 that process signals after channel separation.
- the uplink shared channel receiving unit 2000 includes a subcarrier demapping unit 2005 that demaps the signal after channel separation, an IDFT unit 2004 that performs IDFT (Inverse Discrete Fourier Transform) on the signal after subcarrier demapping, and an IDFT.
- Control information separating section 2003 for separating the separated data signal and control signal
- data demodulating sections 2002 and 2007 for demodulating the separated data signal and control signal, respectively
- channel decoding section 2001 for channel-decoding the signal after data demodulation , 2006.
- the uplink control channel receiving unit 2100 includes a subcarrier demapping unit 2104 that demaps the signal after channel separation, and a deblock spreading unit that despreads the signal after subcarrier demapping using a block spreading code (OCC). 2103, a cyclic shift separation unit 2102 that removes the cyclic shift from the signal after despreading and separates the target user's signal, and a channel selection data detection unit 2101 that controls the resource candidate information based on the mapping table. is doing.
- OCC block spreading code
- channel selection data detection section 2101 notifies retransmission response signal candidate information to subcarrier demapping section 2104, inverse block spreading section 2103, and cyclic shift separation section 2102, and retransmission response information for each CC. Is detected.
- the mapping table of the base station device may be common to the mapping table of the mobile terminal device.
- the control information transmission channel selection unit 2201 detects a channel used for transmission of a retransmission response signal that is feedback control information, and controls output switching from the uplink shared channel reception unit 2000 or the uplink control channel reception unit 2100. To do.
- the retransmission response signal is included in the PUSCH and transmitted, the information output from the uplink shared channel receiving unit 2000 is output as the retransmission response signal.
- the retransmission response signal is transmitted on the PUCCH, the information output from the uplink control channel receiving unit 2100 is output as the retransmission response signal.
- the SRS signal receiving unit 2300 includes a subcarrier demapping unit 2302 for demapping the SRS signal after channel separation, and an SRS reception quality measuring unit 2301 for measuring the reception quality of the SRS signal after subcarrier demapping. Yes.
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Abstract
Description
Claims (7)
- 複数の基本周波数ブロックで構成されるシステム帯域で無線通信を行う移動端末装置であって、
前記複数の基本周波数ブロック毎の下りリンク共有チャネル信号を復調する復調部と、
復調された前記下りリンク共有チャネル信号に基づいて、前記複数の基本周波数ブロック毎の再送応答信号の状態を判定する判定部と、
前記複数の基本周波数ブロックの中から選択された特定の基本周波数ブロックの上りリンク制御チャネルに、前記複数の基本周波数ブロックの再送応答信号をマッピングする上りリンク制御チャネル処理部と、を有し、
前記上りリンク制御チャネル処理部は、前記上りリンク制御チャネルから複数の割り当てリソースを選択し、前記複数の基本周波数ブロックの再送応答信号の状態を、位相偏移変調によるビット情報及びチャネル選択情報で規定することを特徴とする移動端末装置。 A mobile terminal device that performs wireless communication in a system band composed of a plurality of fundamental frequency blocks,
A demodulator that demodulates a downlink shared channel signal for each of the plurality of fundamental frequency blocks;
A determination unit that determines a state of a retransmission response signal for each of the plurality of basic frequency blocks based on the demodulated downlink shared channel signal;
An uplink control channel processing unit that maps retransmission response signals of the plurality of basic frequency blocks to an uplink control channel of a specific basic frequency block selected from the plurality of basic frequency blocks;
The uplink control channel processing unit selects a plurality of allocation resources from the uplink control channel, and defines the state of retransmission response signals of the plurality of basic frequency blocks by bit information and channel selection information by phase shift keying A mobile terminal device. - 前記割り当てリソースの数及びコードワード数に応じて前記複数の基本周波数ブロック毎の再送応答信号の状態が定められたマッピングテーブルを有し、前記上りリンク制御チャネル処理部は前記マッピングテーブルに基づいて、前記位相偏移変調によるビット情報及び前記チャネル選択情報を規定することを特徴とする請求項1記載の移動端末装置。 A mapping table in which a state of a retransmission response signal for each of the plurality of basic frequency blocks is determined according to the number of allocated resources and the number of codewords, and the uplink control channel processing unit is based on the mapping table, The mobile terminal apparatus according to claim 1, wherein bit information by the phase shift keying and the channel selection information are defined.
- 前記割当てリソースの数が前記コードワード数に応じて決定されることを特徴とする請求項1記載の移動端末装置。 The mobile terminal apparatus according to claim 1, wherein the number of the allocated resources is determined according to the number of codewords.
- 前記上りリンク制御チャネル処理部は、前記第1の基本周波数ブロック及び前記第2の基本周波数ブロックが1コードワード伝送である場合、前記割り当てリソース数を2個に設定し、前記マッピングテーブルに基づいて、前記第1の基本周波数ブロックの再送応答信号の状態であるACK、NACK、DTXを個別に規定し、前記第2の基本周波数ブロックの再送応答信号であるDTXの状態を個別に規定せずに状態数を削減することを特徴とする請求項3記載の移動端末装置。 The uplink control channel processing unit sets the number of allocated resources to two when the first basic frequency block and the second basic frequency block are 1 codeword transmission, and based on the mapping table ACK, NACK, and DTX that are retransmission response signal states of the first basic frequency block are individually defined, and the state of DTX that is the retransmission response signal of the second basic frequency block is not individually defined. The mobile terminal apparatus according to claim 3, wherein the number of states is reduced.
- 前記上りリンク制御チャネル処理部は、前記第1の基本周波数ブロック及び前記第2の基本周波数ブロックが1コードワード伝送である場合、前記割り当てリソース数を2個に設定し、前記マッピングテーブルに基づいて、前記第2の基本周波数ブロックの再生応答信号であるACKの状態を個別に規定することを特徴とする請求項3記載の移動端末装置。 The uplink control channel processing unit sets the number of allocated resources to two when the first basic frequency block and the second basic frequency block are 1 codeword transmission, and based on the mapping table The mobile terminal apparatus according to claim 3, wherein the state of ACK that is a reproduction response signal of the second basic frequency block is individually defined.
- 複数の基本周波数ブロックで構成されるシステム帯域で無線通信を行う無線通信方法であって、
移動端末装置において無線基地局装置から送信された前記複数の基本周波数ブロック毎の下りリンク共有チャネル信号を受信して復調する工程と、復調された前記下りリンク共有チャネル信号に基づいて、前記複数の基本周波数ブロック毎の再送応答信号の状態を判定する工程と、前記複数の基本周波数ブロックの中から選択された特定の基本周波数ブロックの上りリンク制御チャネルに、前記複数の基本周波数ブロックの再送応答信号をマッピングする工程と、を有し、
前記移動端末装置は、前記複数の基本周波数ブロックの再送応答信号をマッピングする工程において、前記上りリンク制御チャネルから複数の割り当てリソースを選択し、前記複数の基本周波数ブロックの再送応答信号の状態を、位相偏移変調によるビット情報及びチャネル選択情報で規定することを特徴とする無線通信方法。 A wireless communication method for performing wireless communication in a system band composed of a plurality of fundamental frequency blocks,
Receiving and demodulating a downlink shared channel signal for each of the plurality of basic frequency blocks transmitted from a radio base station apparatus in a mobile terminal device; and based on the demodulated downlink shared channel signal, A step of determining a state of a retransmission response signal for each fundamental frequency block; and a retransmission response signal of the plurality of fundamental frequency blocks in an uplink control channel of a specific fundamental frequency block selected from the plurality of fundamental frequency blocks. Mapping
In the step of mapping retransmission response signals of the plurality of basic frequency blocks, the mobile terminal apparatus selects a plurality of allocation resources from the uplink control channel, and sets the state of the retransmission response signals of the plurality of basic frequency blocks, A wireless communication method characterized by being defined by bit information and channel selection information by phase shift keying. - 前記移動端末装置は、前記複数の基本周波数ブロックの再送応答信号をマッピングする工程において、前記割り当てリソースの数及びコードワード数に応じて前記複数の基本周波数ブロック毎の再送応答信号の状態がそれぞれ規定されたマッピングテーブルを用いることを特徴とする請求項6記載の無線通信方法。 In the step of mapping the retransmission response signals of the plurality of basic frequency blocks, the mobile terminal apparatus defines a state of the retransmission response signal for each of the plurality of basic frequency blocks according to the number of allocated resources and the number of codewords. 7. The wireless communication method according to claim 6, wherein the mapping table is used.
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US20130176928A1 (en) | 2013-07-11 |
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TWI437840B (en) | 2014-05-11 |
TW201220751A (en) | 2012-05-16 |
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